The Indus Valley Civilization

The Indus Valley Civilization (also called the Harappan Civilization) flourished from roughly 2600 to 1900 BCE in what is now Pakistan and northwestern India. It was contemporary with Sumerian Mesopotamia and Old Kingdom Egypt, and at its peak was larger in geographic extent than either. Major cities included Mohenjo-daro, Harappa, Dholavira, and Lothal, plus hundreds of smaller settlements. Cities featured grid-pattern street layouts, extensive drainage systems, large public buildings (like the Great Bath of Mohenjo-daro), standardized weights and measures, and sophisticated craftsmanship in pottery, metals, and beads. Agriculture relied on the Indus and Saraswati rivers; trade connected the civilization to Mesopotamia.

The Indus Valley remains mysterious in important ways. The Indus script, found on thousands of seals and other artifacts, has not been deciphered despite many attempts. Linguists debate whether it represents a full writing system or shorter ritual or commercial markings. Without decipherment, we know little about the civilization is language, religion, government, or daily life beyond what archaeology can show. We do not know what the people called themselves, who their kings or priests were, or what stories they told. The civilization declined around 1900-1700 BCE; causes are debated but probably involve some combination of climate change (the monsoons may have weakened), shifting river patterns (the Saraswati appears to have dried up), and possibly disease or overuse of agricultural land. The decline was gradual rather than catastrophic; cities were depopulated rather than violently destroyed.

The Indus Valley occupies an unusual place in popular memory. Many South Asians today see it as part of their heritage; the Indian government has invested heavily in archaeology, and Mohenjo-daro is now in Pakistan. The civilization is often less prominent in textbooks than its size and accomplishments warrant. Recent scholarship has shifted views in important ways. Earlier claims that the civilization fell to Aryan invasions have been largely abandoned in favor of climate-driven gradual decline. The relationship between the Indus people and modern South Asians is complex; genetic studies suggest mixing with later migrating populations rather than simple replacement. The Indus Valley remains one of the most important and least understood early civilizations.

The Indus Valley is one of the most consequential and most enigmatic ancient civilizations. The next lesson covers another impressive civilization that flourished much later: the Khmer Empire of Angkor.